She competed in the 2004 Summer Olympics, and won the silver medal in the over 75 kg competition, with a total of 302.5 kg.[1]

On September 26, 2007, Jang won her third straight world championship overall title in the women's over 75 kg category by lifting 319 kg of overalls in total (138 kg in the snatch, 181 kg of overalls in the clean and jerk).[2] She also surpassed the world record, which was set by herself in May 2006 in Wonju, Korea, by one kilogram. Mu Shuangshuang, who lifted 319 kg in overalls as well, ranked second because of bodyweight, but broke the record an attempt earlier.[3]